QUOTE(A Little Happy @ Oct 8 2006, 02:08 AM)

So anyway, I'm making my way through another of Beethoven's sonata, and there's a trill where I have to play an octave and then trill with my 4th and 5th fingers (right hand of course). And well, I've never encountered such a scenario in my nine years of playing, and I can't do it. My fingers won't lift up at the speed that's necessary. In fact, I've found a lack of control between those two fingers overall.
Is there any...muscle-related reason why this occurs? Or should I ask my piano teacher about specific exercises to work on my ability to trill with my 4th and 5th fingers? I've found my 3rd and 4th finger trill is not as strong as the others either, but it's passable. However, I just can't manage a trill with my 4th and 5th!
The funny part is that I can manage one with my left hand...does this have to do with the fact that I play violin?
4th and 5th fingers share the same tendon and so it is probably much more difficult to trill with these two. You need to be very free when trilling. It should be a physically pleasurable experience and if not, it is probably to do with discomfort either in the hand, arm or shoulder.
You could try holding down 4th finger and then very slowly to begin with, playing the key next to it with 5th finger and repeat it several times. Watch how your fingers behave so you can check the movement. A little rotary wrist movement can help too. Perhaps exagerate the movements to begin with so as to encourage freedom. Repeat this the other way around, holding down the 5th finger and then repeating the 4th finger movement on one key. You might find that the 4th will not lift very high. Do not force it....freedom of movement is the key here and also remember to do it slowly first. Maybe do this for a few days and don't be tempted to suddenly try to perfrom the trill at full speed too soon! Remember also to continually check how your hand, arm and shoulder are feeling. Any sign of discomfort, then stop, relax and begin again.
Eventually, the fingers need to be in close contact with the keys as well as the fingers that are resting at the same time but to begin with, lift them fairly high and allow the resting fingers to move high as well to encourage freedom and comfort.
Sometimes allowing your arm to drop to your side as if you were walking along and then shaking quickly in a rotary movement (as if you were shaking water from it) can help as well.
Hope this might help a little.

P.S Which Beethoven sonata are you learning?